Ruling-pen attachment.



R. L INGEBRI.GTSEN. RUUNG PEN ATTACHMENT.

APPLICATION FILED MAR. 12. 1917.

1,262,801. Patented Apr. 1 1918.

RALPH L. INGEBRIG S'EN', or MISSOULA, ivroNTAnA.

norms-P N ATTACHMENT.

Application filed March 12, 1917. Serial K0115 1359.

To all whom it may concern:

Be it known that I, RALPH L. INGEBRIGT- SEN, a citizen of the UnitedStates, residing at Missoula, in the county of Missoula, State ofMontana, have invented certain new andv useful Improvements inRuling-Pen Attachments; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in draftsmens ruling pens, andparticularly to attachments therefor.

One object of the present invention is to provide a novel and simpledevice foraccurately gaging the width of the line the pen is to make.

Another object is to provide a device of this character which can bequickly and easily slipped onto the ordinary ruling pen now in use.

A further object is to provide a device of this character whereby thedraftsman can instantly tell to what degree he is opening or closing thejaws of the pen, when he turns the adjusting screw in either direction.

Other objects and advantages will be apparent from the followingdescription when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is a front elevation of a ruling pen equipped with my gageattachment.

Fig. 2 is a side elevation of the same.

Fig. 3 is an enlarged longitudinal sectional view taken on the line 3-3of Fig. 1.

Fig. 4 is an enlarged transverse sectional view taken on the line 4 4:of Fig. 1.

Referring particularly to the accompanying drawing, 10 represents therigid or stationary leg or jaw of the ruling pen, and 11 the adjustableand flexible le or jaw. The adjusting screw 12 is disposec loosely inthe opening 13 in the jaw 11, and threaded into an opening 14: in thejaw 10. The upper portion of the jaw 11 is reduced in thickness orflattened to producethe required amount of flexibility in the jaw. Thehead of the screw is formed with the milling 15 around the peripheraledge, as clearly shown in the drawing; In connection with the saidreduced portion of the jaw 11 and the milled head of the screw myinvention is used.

The attachment includes a base member 16 having an integral pair ofoutwardly Specification of Letters rate' a I Patented bowed'legs 17whichh'ave their'extremities directed inwardly toward each other, at 16,andfarranged to grip the opposite edges of the flattened'portion of thelegor jaw 11, when the screw is removed. Formed integrally with thebase, and extending longitudinally thereof,--is a cylindrical member 18,both ends and the intermediate portion of one side of which are open, asclearly shown in the sectional View Fig. 4. Within the cylindricalmember there is secured a tubular member 18, and in the outer portion ofthe lower end of the tubular member there is formed a bayonet slot 19.Slidably disposed in the lower end of the member 18 is a pin 20, theprojecting end of which is formed with a double chisel point 21,engaging with the milling of the head of the screw. In the other end ofthe member 18 there is secured a transverse pin 22, and within themember 18, and engaging against the pin 22, and against the inner end ofthe pin 20, is a coil spring 23, the tendency of which is to normallyurge the pin 20 out of the member 18. Carried by the pin 20, and playingin the bayonet slot, is a headed finger-piece 24. By grasping thisfinger piece the pin 20 can be withdrawn into the tubular member wherebysaid pin can be held out of engagement with the screw head.

It will thus be seen that the double chisel point of the pin 20 willratchet over the milling of the screw head as the screw is turned, andby the feel of this engagement, by the fingers of the draftsman, as heturns the screw, the distance the screw has been turned in eitherdirection, can be accurately told. Thus, when the screw is turned twonotches of the milling in one direction, the draftsman knows how muchwider or thicker the line will be, than beforethe screw was turned. Thisis especially of value in making shade lines, where the lines aresuccessively made thicker or thinner, according to the direction ofmovement of the angle or square.

The device is extremely simple in construction, and can be quickly andeasily applied to the ordinary pen, or removed there from, by simplyremoving the adjusting screw of the pen.

By reason of the fact that the legs 17 are resilient, the device will befirmly but releasably engaged on the leg or jaw 11 of the pen. It maynot be necessary to remove the adjusting screw 12 when applying the dewith inturned extremities. adapted for embracing engagement with fone awof the pen, the pen being provided with a milled V V a tubular membercarried in the base and having a bayonet slot in the headed screw,

side at one end thereof, a coil spring disposed in the tubular member, adouble chisel carried by pointed pin slidable in the tubular member andengaging with the milled head of the screw, means for holding the springin en- 15 gagement with the pin, and a fingerpiece the pin and slidablein the said bayonet slot. v

In testimony whereof, I affix my signature, in the presence of'twowitnesses.

RALPH L. INGEBRIGTSEN. \Vitnesses:

FRED R. ANGEVINE, EDWARD SIMPKiNs.

Gepiles of this patent may be obtained for five, cents each, byaddressing the Commissioner of IPatentsJ Washington, D, G.

